14th Conference on Satellite Meteorology and Oceanography


AVHRR/MODIS relative calibration bias estimates deduced from the SNO method: Uncertainties due to earth-scene inhomogeneities

Robert A. Iacovazzi Jr., ERT, Inc., Jessup, MD; and C. Cao and P. Ciren

The Simultaneous Nadir Overpass (SNO) method estimates the magnitude of relative calibration biases between two similar radiometers flown on different polar-orbiting satellites. For this purpose, the SNO method uses radiometer measurements taken from satellite overpasses of a given earth location that occur within 30 seconds of each other. This reduces uncertainties of intersatellite radiometer calibration bias estimates that can result from change of the atmosphere, land, and/or ocean within the time period between satellite overpasses. On the other hand, several uncertainties remain in the SNO method that are mainly related to a combination of instrument differences and earth-scene spatial/temporal inhomogeneities. Since these uncertainties need to be understood and quantified in order to increase confidence in the SNO method, we explore in this study earth-scene inhomogeneity related uncertainties of intersatellite calibration biases estimated from 22 August to 22 October 2005 SNOs occurring between Polar-orbiting Operational Environmental Satellite (POES) Advanced Very High Resolution Radiometer (AVHRR) and the Earth Observing System (EOS) Moderate Resolution Imaging Spectroradiometer (MODIS).

extended abstract  Extended Abstract (384K)

Poster Session 4, Operational Products
Wednesday, 1 February 2006, 2:30 PM-2:30 PM, Exhibit Hall A2

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